promise for future showers?

The project in question is an existing single story C&S being renovated. There is a restroom core with 2 existing showers (the required amount based on our default occupancy counts) that needs asbestos remediation and renovation work on the showers before it can be used by tenants. The Owner is not renovating this restroom core as part of this scope because he is not sure of the tenant type and thinks that the tenant may want to change the location of the restroom core. The Owner wants to make a commitment to remediating the restroom core and making the showers fully usable if the future tenant would like to keep the restroom core where it is. Is a written promise to remediate (we're doing this for the brownfield credit anyway) and renovate the showers enough to satisfy requirements here? Also, if the tenant wishes to move the core, could we include in Special Circumstances that showers will be required to be installed per Tenant Lease Agreement, and show that the Owner would cover the cost of the showers?